- #1
brunettegurl
- 138
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Hi
1) Suppose that it is known that in a certain large population,10%of is is colourblind. If a random sample of 25 people is drawn from the population, find the probability that exactly 8 of them are colourblind.
My Take: is to use the Poisson Probability: f(x)= (e^-[tex]\lambda[/tex])* [tex]\lambda[/tex] x/x! where [tex]\lambda[/tex]= 0.1 and do it for x=1,2,3...till 8
Im not sure if my take is correct.
2) Supposse that the cholesterol values for a certain population are approx. normally w/mean=200 and standard deviation 20. 90% of the population have cholesterol values greater than x. Find x
My Take: 0.90= P(X[tex]\leq[/tex]x)
0.90= P(X-200/20[tex]\leq[/tex]x-200/20)
0.90=P(z[tex]\leq[/tex]x-200/20)
z0.90=1.20
x= 20*z0.90+ 200
=224
the answer should be 174.4
any help would be appreciated
Thanks
1) Suppose that it is known that in a certain large population,10%of is is colourblind. If a random sample of 25 people is drawn from the population, find the probability that exactly 8 of them are colourblind.
My Take: is to use the Poisson Probability: f(x)= (e^-[tex]\lambda[/tex])* [tex]\lambda[/tex] x/x! where [tex]\lambda[/tex]= 0.1 and do it for x=1,2,3...till 8
Im not sure if my take is correct.
2) Supposse that the cholesterol values for a certain population are approx. normally w/mean=200 and standard deviation 20. 90% of the population have cholesterol values greater than x. Find x
My Take: 0.90= P(X[tex]\leq[/tex]x)
0.90= P(X-200/20[tex]\leq[/tex]x-200/20)
0.90=P(z[tex]\leq[/tex]x-200/20)
z0.90=1.20
x= 20*z0.90+ 200
=224
the answer should be 174.4
any help would be appreciated
Thanks